Improvement in steam-boilers



I GEORGE H. MILLEN AND WILLIAM FEELY, OF HULL, QUE BEG, CANADA.

IMPROVEMENT IN STEAM-BOILERS. A

Specification forming part of Letters Patent No. 193,126, dated July 17,1877; application filed April 4, 1877.

To all whom it ma concern:

Be it known that we, GEORGE HENRY MILLEN' and WILLIAM FEELY, both of thecity of Hull, in the county of Ottawa and Province of Quebec, Canada,have invented certain Improvements in Steam-Boilers, of which thefollowing is a specification, reference being had'to the accompanyingdrawlngs.

Our invention relates to upright tubular boilers and consists in theemployment of a central tube or reservoir to receive a supply of fueland feed the same to the fire automatically, in combination with awater-jacket surrounding the same; in the use of pipes extending downWithin the fire-chamber, and containing rotary spiral blades to preventthe deposition of scale, and to assist in producing the circulation ofthe water and the liberation of the steam, and in other details.

Figure 1- represents a vertical central section of our boiler; and Figs.2 and 3, cross sections of the same on the line 00 w and 3 y.

A represents the outside cylindrical shell of the boiler; B, thefire-chamber, formed in the base of the boiler; and O, a verticalcentral tube, extending from the top of the boiler downward to the topof the fire-chamber, and forming an inlet and reservoir for the fuel.

As shown in the drawing, the upper end of the-tube O is extended abovethe body of the boiler, and is surrounded by a water-jacket, a, whichlatter extends down into the boiler a considerable distance to form theinside wall of an annular smoke-chamber, D. The chamber D, which isformed, as shown, entirely within the body of the boiler, so as to beentirely inclosed by the water and steam, has its outside wall inclinedinward toward its top, and is connected at the bottom by vertical fluesE with the fire-chamber B, as shown. The flame and heated products ofcombustion, passing upward from the fire-chamber through the flues Einto the chamber D, impinge against the inclined walls of the latter,and fill the'interior space in such manner that the heat is rapidly andfully communicated to the surrounding water.

The upper outer'wall of the chamber D is extended upward into a topchamber, G, provided with an outlet-flue, H, as shown, the

arrangement being such that the products of combustion are compelled topass up over and descend on the outside of the wall in order to reachthe outlet, whereby they are retarded and the waste of heat prevented.

From the top of the boiler, outside of the smoke-chamber D, tubes I arecarried upward to the top of the jacket a, surrounding the centralfeed-tube, as shown.

This arrangement assists in equalizing the pressure, and conducts thesteam into the upper part of the jacket, which is made to serve as asteam-dome and a superheating-chamber, the drying and superheating ofthe steam being effected by the hot gases and vapors in the chamber D,surrounding the jacket. 7

From the water-space of the boiler short tubes J are extended down intothe fire-chamber, below its top or crown-sheet, the lower ends of thetubes being closed while their upper ends are open, so that they remainconstantly filled with water. In each tube J there is mounted aspirally-twisted piece of sheet metal, K, as shown, supported loosely ona pivot, so as to rotate freely, as preferred.

The tubes extending down within the firechamber expose a very largesurface, and greatly increase the heating capacity of the boiler. Theloose spiral blades offer a sufficient resistance to the moving water togive the same a gyratory motion during its pas sage through and at thetime of its emergence from the tubes, while at the same time the actionof the water against the blades, and its resistance tothe spiral motion,causes the blades to rotate, and thereby prevent the deposition ofsediment or scale on the inner surfaces of the tubes.

We are aware that it is old to secure rigidly in'a boiler-flue a centraltube and a spiral rib encircling the same, and we lay no claim thereto,our invention being limited to the use of the spiral blades passingthrough the center of the lines and dividing the same into two equalspaces or spiral channels.

In constructing the boiler it will be provided with any suitablefire-grate in the chamber B, and with a door, L, in one side, to permitthe inspection and the stoking of the fire. The top of the fuel-tube Gwill be closed with a plate, as shown, or other suitable device,

and the various valves, gages, feeding devices, 8w, provided as usual.

In order to facilitate the descent of the fuel, the tube 0 will be madeof increasing diameter toward its lower end; and in order that thefeeding of the fuel may take place automatically, but without danger ofbeing excessive, the mouth of the tube 0 will be carried down nearly tothe usual level of the fire-bed.

Having thus described our invention, what we claim is 1. Thesteam-boiler consisting of the body A, provided with the chambers B andD,flues E, tube 0, and jacket 0,, as shown.

2. In a steam-boiler, the combination of the depending tubes and theloose spiral blades, dividing the same through the center, and servingto insure a circulation and prevent the deposition of sediment.

municating at its lower end and by the pipes I with the interior of theboiler, the chamber D surrounding said jacket, as shown, whereby theproducts of combustion are applied to dry and superheat the steam.

GEORGE HENRY MILLEN. WILLIAM FEELY.

Witnesses:

D. 0. SIMON,

Oflicial Assignee, Hull. E. DODET nORsoNNENs,

Notary Public, Hull City.

